Wordpress Custom Post Type Wrapper

custom_post_type.php

<?php

class custom_post_type {

	//Custom post type name
	public $post_type_name = 'name';

	//Custom metabox key
	public $key = $this->post_type_name = 'key';

	//Custom metabox options
	public $options = array(
			'post_types' => array( $this->post_type_name ),
			'title'      => 'Metabox Title',
			'context'    => 'side', //normal, advanced, side
			'priority'   => 'default' //default, core, high, low
		);

	public post_type_options = array(
				'labels' 	=> array(
						'name' 		     => __( 'Item' ),
						'singular_name'      => __( 'Items' ),
						'add_new' 	     => __( 'Add New' ),
						'add_new_item' 	     => __( 'Add New Item' ),
						'edit_item' 	     => __( 'Edit Item' ),
						'new_item'           => __( 'New Item' ),
						'all_items' 	     => __( 'All Items' ),
						'view_item' 	     => __( 'View Item' ),
						'search_items' 	     => __( 'Search Items' ),
						'not_found' 	     => __( 'No items found.' ),
						'not_found_in_trash' => __( 'No items found in the trash.' ),
						'parent_item_colon'  => '',
						'menu_name' 	     => 'Items'
					),
				'description'   => 'Holds our testimonials and testimonial specific data',
				'public'        => true,
				'menu_position' => 20,
				'menu_icon'     => 'dashicons-admin-comments', //http://melchoyce.github.io/dashicons/
				'supports'      => array( 'title', 'editor' ), // title, editor, thumbnail, page-attributes excerpt, comments
				'has_archive'   => true,
				'rewrite'       => array( 
							'slug'       => 'items', 
							'with_front' => true 
							)
			);

	public function post_type_setup() {
		register_post_type( $this->post_type_name, $this->post_type_options );
	}

//Custom Taxonomies

/*
	public post_taxonomy_options = array(
					'labels'   => array(
							'name'              => __( 'Taxonomys' ),
							'singular_name'     => __( 'Taxonomy' ),
							'search_items'      =>  __( 'Search Taxonomys' ),
							'all_items'         => __( 'All Taxonomys' ),
							'parent_item'       => __( 'Parent Taxonomy' ),
							'parent_item_colon' => __( 'Parent Taxonomy' ),
							'edit_item' 	    => __( 'Edit Taxonomy' ),
							'update_item' 	    => __( 'Update Taxonomy' ),
							'add_new_item'      => __( 'Add New Taxonomy' ),
							'new_item_name'     => __( 'New Taxonomy Name' ),
							'menu_name' 	    => __( 'Taxonomys' ),
							),
				    'hierarchical' => false, // Hierarchical taxonomy (like categories)
				    'rewrite'      => array( 
				    			'slug'         => 'locations', 
				    			'with_front'   => false, 
				    			'hierarchical' => true 
				    			)
			);

	public function post_taxonomy_setup(){
		  register_taxonomy( 'taxonomy', $this->post_type_name, $this->post_taxonomy_options );
	}
*/

//Custom Metabox

	public function custom_meta_add() {

		foreach( $this->options->post_types as $post_type ){
			//$key, $title, $callback, $post_type, $context, $priority, $callback_args
			add_meta_box(
				$this->key,
				esc_html__( $this->options->title, 'example' ),
				array(&$this, 'custom_meta_render' ),
				$post_type,
				$this->options->context,
				$this->options->priority,
				$callback_args = null
			);
		}

	}

	public function custom_meta_render( $object, $box ){

		wp_nonce_field( basename( __FILE__ ), $this->key.'_nonce' );

		$data = get_post_meta( $object->ID, $this->key, true );

		//Render metabox HTML
		//<input type="text" class="widefat" value="" />

	}

	public function custom_meta_save( $post_id, $post = false ){

		//Verify the nonce before proceeding.
		if ( !isset( $_POST[$this->key.'_nonce'] ) || !wp_verify_nonce( $_POST[$this->key.'_nonce'], basename( __FILE__ ) ) ){
			return $post_id;
		}

		//Get the posted data and sanitize it for use as an HTML class.
		$new_meta_value = ( isset( $_POST[$this->key] ) ? $_POST[$this->key] : '' );

		//Get previously saved data
		$meta_value = get_post_meta( $post_id, $this->key, true );

		//Add, update and delete data
		if( $new_meta_value && '' == $meta_value ){
			add_post_meta( $post_id, $this->key, $new_meta_value, true );
		} elseif ( $new_meta_value && $new_meta_value != $meta_value ){
			update_post_meta( $post_id, $key, $new_meta_value );
		} elseif ( '' == $new_meta_value && $meta_value ){
			delete_post_meta( $post_id, $key, $meta_value );
		}

	}

	public function custom_meta_setup() {

		//Add metabox
		add_action( 'add_meta_boxes', array(&$this, 'custom_meta_add' ));
		//Save metabox
		add_action( 'save_post', array(&$this, 'custom_meta_save'));

	}

	public function __construct(){

		//Add custom post types
		add_action( 'init', array( &$this, 'post_type_setup' ) );
		//Add custom taxonomy to post type
		//add_action( 'init', array( &$this, 'post_taxonomy_setup' ), 0 );
		//Create options object
		$this->options = (object)$this->options;
		//Add custom metabox
		add_action( 'init', array( &$this, 'custom_meta_setup' ) );

	}

}

new custom_post_type();